TO THE OWNER OR USER: The service manual you are reading is intended to provide you, and the maintenance or service technician, with the information needed to install, start up, clean, maintain and service this ice system. Single System RL This Remote Low side unit is the freezer portion of a commercial ice machine. It is designed to be connected to the condensing section of a refrigeration system, specifically a supermarket R-404A system. Table of Contents FOR THE INSTALLER: Specifications........................... Page 2 FOR THE INSTALLER................................... Page 3 FOR THE ELECTRICIAN.................................. Page 4 FOR THE PLUMBER.................................... Page 5 FOR THE INSTALLER: Final Check List Initial Start Up.................. Page 6 COMPONENT IDENTIFICATION.............................. Page 7 COMPONENT DESCRIPTION: Control Box........................ Page 8 COMPONENT DESCRIPTION: Evaporator......................... Page 9 ELECTRICAL SEQUENCE................................. Page 10 OPERATION........................................ Page 11 OPERATION: Refrigeration................................. Page 12 MAINTENANCE AND CLEANING............................. Page 13 MAINTENANCE....................................... Page 14 CLEANING........................................ Page 15 SERVICE DIAGNOSIS: Condition - No Ice Being Produced................ Page 16 REMOVAL AND REPLACEMENT............................. Page 18 REMOVAL AND REPLACEMENT: Bearing And Breaker.................. Page 19 REMOVAL AND REPLACEMENT............................. Page 20 REMOVAL AND REPLACEMENT............................. Page 21 REMOVAL AND REPLACEMENT: Evaporator....................... Page 22 REMOVAL AND REPLACEMENT: Gearmotor....................... Page 23 CIRCUIT BOARD TESTING................................ Page 24 Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper. This manual was printed on recycled paper. Keep it for future reference. Note the Warning symbol where it appears. It marks a potential hazard. Page 1
Single System RL FOR THE INSTALLER: Specifications The unit is designed to fit a variety of Scotsman storage bins. See sales literature for more information. Installation Limitations: The remote low side is designed for indoor installations only. The machine must also be in a controlled environment where the air temperature does not fall below 50 0 F., or go above 100 0 F. The water temperature must be between 40 0 F. and 100 0 F. The electrical power supply must not drop below -5% of the lowest nameplate voltage or go above 10% of the highest nameplate voltage. Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards of U.L., N.S.F., and C.U.L. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way, including the use of any parts and/or other components not specifically approved by Scotsman. Scotsman reserves the right to make design changes and/or improvements at any time. Specifications and designs are subject to change without notice. SPECIFICATIONS: Model Cabinet Size System Refrigerant BTUH required Voltage Ice Type FME1200RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Flaker NME950RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Nugget FM1202RL 21"w x 27"h x 24"d R-22 8,000 208-230 Flaker NM952RL 21"w x 27"h x 24"d R-22 8,000 208-230 Nugget FME1500RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Flaker NME1250RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Nugget Page 2
FOR THE INSTALLER Select the Location: The unit can only be installed indoors within the limitations described on page 2. The ice machine will have to be connected to the building s refrigeration system, check to be sure that the system has enough extra capacity to handle a minimum of additional 8,000 BTU s per hour @ 110 0 F. liquid line temperature (assume a 0 0 F. evaporator temperature). Storage Bin: Using a mechanical lift, install the ice machine onto the top of the storage bin. Fasten the ice machine to the bin using (4) 5/15-18 2.5" cap screws. Level the assembly by: a. Turning the leg levelers in or out on the standard legs. b. Use shims under the heavy duty legs of the KLP4. Locate the Nameplate: The nameplate is located on the back panel of the machine, and contains the electrical characteristics particular to the unit being installed. Refrigeration Installation: The skills of a refrigeration technician are required to connect the ice machine to the buildings refrigeration system. Notes: Suction Line and Liquid Line Stubs are at the back of the cabinet. 1.5 ounces of the appropriate refrigerant is in the system as a holding charge. Be sure there is enough BTU capacity. Be sure that the liquid connection is NOT in series with another liquid line valve. Local Codes must be observed. A P-trap should be installed where there will be more than 10 of vertical rise in the suction line. Single System RL TYPICAL INSTALLATION: ALLOW ROOM FOR SERVICE ACCESS FME1200RL B90 STORAGE BIN BX87 BIN EXTENSION Page 3
Single System RL FOR THE ELECTRICIAN Electrical Connections: Locate the nameplate for the current requirements, and then determine the wire size and type per the National Electric Code. The machine requires a solid chassis to earth ground wire. Refer to the wiring diagram. The ice machine should be connected to it s own electrical circuit, and be individually fused. Voltage, when the unit is under full load, must remain within the limitations listed on page 2. LOW VOLTAGE CAN CAUSE EQUIPMENT MALFUNCTION AND/OR DAMAGE All external wiring should conform to the National, State, and local electrical codes. Usually the services of a licensed electrician will be required. CONFORM TO ALL APPLICABLE CODES DETAIL OF JUNCTION BOX JUNCTION BOX POWER SUPPLY Page 4
FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Supply: The recommended water supply line is 3/8" O.D. copper tubing, with a minimum operation pressure of 20 PSIG, and a maximum of 80 PSIG. Connect to cold water using the male flare connection at the back of the machine. Install a shut off valve in an accessible space between the ice maker and the water supply. Single System RL Drain System: All drains are of the gravity type, and must have a minimum of 1/4" fall per foot of horizontal run. The drains must be installed to conform to local plumbing codes. The use of a vent at the machine and at the bin will allow the system to drain properly. Use only rigid tubing for drains; insulation of the bin drain is recommended. 3/8" MALE FLARE SHUT OFF VALVE 3/4" FPT VENT THIS DRAIN FIELD SUPPLIED WATER FILTER WATER INLET BIN DRAIN FLOOR DRAIN Page 5
Single System RL FOR THE INSTALLER: Final Check List 1. Is the unit installed where the air and water temperatures are within and will remain within the limitations for the unit? 2. Is there 6" clearance at the rear of the machine for utility connections? 3. Has the water supply line be checked for pressures between 20 and 80? 4. Has the unit been leveled? 5. Has the shipping material been removed from inside the cabinet? 6. Have the electrical connections been made? 7. Have the drains been installed and checked for leaks? 8. Has the refrigeration supply been installed and checked for leaks? 9. Has the bin and cabinet been wiped clean or sanitized? 10. Has the warranty registration card been properly filled out and mailed to Scotsman? 11. Has the owner been given the service manual and been instructed on how to maintain the ice maker? Initial Start Up 1. Remove the top and front panels. 2. Open the water valve, and observe that the two float reservoirs fill up with water and shut off. 3. Switch on the electrical power. 4. Open the hand valve (in the liquid line). 5. Open the ball valve (in the suction line). 6. Switch on the master switch, and observe: The liquid line valve opens The gearmotor runs Within a short time, that side of the machine begins to make ice. Water flows from the water reservoir, and the float drops, letting in more water. 7. When operating, the sight glass should remain full, and the low side pressure will be about: RLE1202/952-25 PSIG + or - 2 PSIG RLE1200/950-36 PSIG + or - 2 PSIG RLE1500/1250-25 PSIG + or - 2 PSIG Gearmotor amp draw should not exceed the nameplate rating. 8. Check the system very carefully for any refrigerant leaks, repair as needed. 13. Has the owner been given the name and telephone number of the local Scotsman service agency? November 1999 Page 6
COMPONENT IDENTIFICATION Liquid line valve This valve operates to turn the ice making process on and off. When the ice level drops in the ice chute, the ice level sensor will cause the circuit board to close the liquid line relay, which energizes the liquid line valve. The liquid line valve opens, and liquid refrigerant flows to the thermostatic expansion valve. Thermostatic Expansion Valve The metering device of the system, the valve senses the temperature of the suction line and varies the amount of liquid refrigerant that passes through the valve into the evaporator, thus maintaining a constant level of refrigeration. TXV s are factory set. Do not adjust unnecessarily. DO NOT ADJUST THE TXV UNTIL THE EPR HAS BEEN SET. The superheat setting is 4-8 0 F. Measure the temperature of the evaporator outlet at the TXV bulb, and check the low side pressure at the EPR valve. Convert the pressure to temperature (using a temperature pressure chart) and subtract the Single System RL amount from the outlet temperature. The result is the superheat. Use an electronic thermometer. EPR: Evaporator Pressure Regulator Valve This valve maintains a constant pressure on its inlet (evaporator) side regardless of the pressure on the outlet (suction) side. The EPR is factory set, adjust only if needed. After adjusting, re-check TXV superheat. EPR Settings: RLE1202/952: 25 PSIG + or - 2 PSIG RLE1200/950: 36 PSIG + or - 2 PSIG RLE1500/1250: 25 PSIG + or - 2 PSIG Evaporator: Where the water is frozen into ice crystals. As the water cools, it begins to turn into ice, and the slowly turning auger lifts the ice, as it is being made, and forces it up and out of the breaker or spout where the extra water is compressed out of the ice. The ice then drops through the chute, into the storage bin. THERMO VALVE EPR VALVE LIQUID LINE VALVE November 1999 Page 7
Single System RL COMPONENT DESCRIPTION: Control Box Circuit Board: Controlling the ice machine through sensors and relays. The sensors are: ice level, and water level. The relays are for the gear motor (with a built in time delay to clear the evaporator of ice when the unit turns off) and for the liquid line valve. Transformer: Supplies low voltage to the circuit board. On/Off Switch: Manual control for that side of the machine. ON/OFF SWITCH TERMINAL STRIP TRANSFORMER CIRCUIT BOARD Page 8
COMPONENT DESCRIPTION: Evaporator Evaporator: A refrigerated vertical tube filled water and containing a water seal and auger. Auger: A solid stainless steel double spiral auger, it pushes the ice crystals up to the top of the evaporator. Water Seal: A two part "face" seal, the top half rotating with the auger, the bottom half stationary, the sealing action being where the two seal "faces" meet. Ice Sweep: A plastic cap with "fingers". It revolves with the auger to "sweep" the ice into the ice chute. Divider: Where the ice is compressed and much of the extra water is squeezed out of it before it is discharged into the bin. Single System RL Motor: A split phase motor that drives the gear reducer. Bearing: As the ice is pushed up the evaporator, the auger is thrust down, and pressure from the auger thrust is taken up by this bearing. BEARING ICE SWEEP DIVIDER EVAPORATOR AUGER WATER SEAL MOTOR Page 9
Single System RL ELECTRICAL SEQUENCE Refer the wiring diagram as needed. Each system is separate If the machine is switched off at the master switch, but is otherwise ready to go, switching the master switch to on does the following: The bin empty light on the circuit board goes on There is a 15 second delay If there is enough water in the reservoir, the circuit board will allow the machine to start up. Start up consists of: The liquid line relay and auger motor relay become energized, connecting power to the windings of the auger motor. The auger motor starts, and the centrifugal switch closes, connecting power to the liquid line valve coil. The liquid line valve opens, and the refrigerant flows to the thermostatic expansion valve and into the evaporator. As ice goes past the ice level sensors, the bin empty light will stay on, and the machine will continue to run, unless the ice stays between the sensors for more than 15 seconds (bin full). At that point, the bin empty light goes out, and the machine shuts down. Shut Down consists of: The liquid line relay opens. The liquid line valve closes Ice making stops The auger motor is run by the circuit board for 2 more minutes, clearing out ice in the evaporator, and then The auger motor relay opens, and the auger motor stops. If the ice level sensor is clear (bin empty) for more than 15 seconds, the machine will start up again. Another purpose of the circuit board is to turn the machine off if there is not enough water in the machine. When the water level in the reservoir falls below the water level sensor, the machine will "shut down" When the water refills the reservoir, the machine will start up again. Separate from the circuit board: The master switch is the manual control for each system, but it is not a service disconnect. Page 10
OPERATION Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, goes to the water reservoir which it enters through the float valve. Single System RL The water then goes out the bottom of the reservoir tank to the bottom of the evaporator. Reservoir overflow or evaporator condensation is routed to the drain. WATER INLET RESERVOIR ICE CHUTE WATER LEVEL EVAPORATOR WATER INLET DRIP PAN DRAIN WATER SCHEMATIC Page 11
Single System RL OPERATION: Refrigeration The remote high side supplies high pressure liquid refrigerant to the liquid line connection on the ice machine. After the sight glass, there is a liquid line leading to a liquid line valve. When the ice level sensor causes the circuit board to energize the liquid line valve, the valve opens, allowing the liquid refrigerant to enter the expansion valve. The thermostatic expansion valve meters the liquid refrigerant into the evaporator, where it boils off (evaporates) and absorbs heat. It then moves through the ball valve and into the evaporator pressure regulator valve, or EPR. The EPR keeps the evaporator pressure above a predetermined point, even though the suction line pressure of the remote high side system may vary. The refrigerant, now a low pressure gas, moves into the suction line of the remote high side system. HAND VALVE LIQUID LINE VALVE THERMO VALVE EVAPORATOR LIQUID LINE SIGHT GLASS BALL VALVE SUCTION LINE EPR VALVE Page 12
MAINTENANCE AND CLEANING Single System RL A Scotsman Ice System represents a sizable investment of time and money in any company s business. In order to receive the best return for that investment, it MUST receive periodic maintenance. It is the USER S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, and less costly in the long run, to avoid possible down time by keeping it clean; adjusting it as needed; and by replacing worn parts before they can cause failure. The following is a list of recommended maintenance that will help keep the machine running with a minimum of problems. Maintenance and Cleaning should be scheduled at a minimum of twice per year. ICE MAKING SYSTEM: In place cleaning 1. Check and clean any water treatment devices, if any are installed. 2. Pull out and remove the front panel. 3. Move the ON-OFF switch to OFF. 4. Remove all the ice from the storage bin. 5. Remove the cover to the water reservoir and block the float up. 6. Drain the water reservoir and freezer assembly using the drain tube attached to the freezer water inlet. Return the drain tube to its normal upright position and replace the end cap. 7. Prepare the cleaning solution: Mix eight ounces of Scotsman Ice Machine Cleaner with three quarts of hot water. The water should be between 90-115 degrees F. Scotsman Ice Machine Cleaner contains acids. These compounds may cause burns. If swallowed, DO NOT induce vomiting. Give large amounts of water or milk. Call Physician immediately. In case of external contact, flush with water. Keep out of the reach of children. 8. Slowly pour the cleaning solution into the water reservoir until it is full. Wait 15 minutes, then switch the master switch to ON. 9. As the ice maker begins to use water from the reservoir, continue to add more cleaning solution to maintain a full reservoir. 10. After all of the cleaning solution has been added to the reservoir, and the reservoir is nearly empty, switch the master switch to OFF. 11. After draining the reservoir, as in step 6, wash and rinse the water reservoir. Page 13 12. Go thru steps 13-19 to sanitize the ice machine water system. 13. Mix two gallons of sanitizer solution. Use an approved sanitizer. A possible sanitizer solution may be obtained by mixing two gallons of warm (90-115 o F.) potable water with 1 ounce of household bleach. 14. Slowly pout the sanitizer solution into the water reservoir until the float rises, then switch the master switch ON. 15. As the ice machine uses water from the reservoir, continue to pour the sanitizer solution into the reservoir. 16. After 1 2 of the sanitizer solution has been added to the reservoir, and the reservoir is nearly empty, switch the master switch OFF. 17. Drain the reservoir and thoroughly wash the interior of the reservoir and cover with sanitizer solution. Be sure the drain hose is upright and capped. 18. Remove the block from the float in the water reservoir. 19. Switch the master switch to ON 20. Continue ice making for at least 15 minutes, to flush out any cleaning solution. DO NOT USE any ice produced from the cleaning solution. Be sure no ice remains in the bin. 21. Remove all ice from the storage bin. 22. Add warm water to the ice storage bin and thoroughly wash and rinse all surfaces within the bin. 23. Sanitize the bin interior by washing the interior of the bin with the balance of the sanitizer solution. 24. Switch the master switch ON.
Single System RL MAINTENANCE Electrical Shock Hazard Electrical shock can cause personal injury. Disconnect electrical power before beginning. SLIDE ICE LEVEL CONTROLS OUT OF CHUTE 1. The bin control uses devices that sense light, therefore they must be kept clean enough so that they can "see". At least twice a year, remove the bin control sensors from the base of the ice chute, and wipe the inside clean, as illustrated. 2. The ice machine senses water level by a probe located in the water reservoir. At least twice a year, the probe should be removed from the reservoir, and the tip wiped clean of mineral build-up. CLEAN THE ICE LEVEL CONTROL SENSORS RESERVOIR Inspect the assembly, looking for wear. See Removal and Replacement to replace bearing or seals. Reverse to reassemble. 4. Check and tighten all bolts and screws. ICE SWEEP CLEAN THE WATER LEVEL SENSOR ///////////////////////////// CAUTION: THE TIMP IS MADE OF GLASS /////////////////////////////// 3. The bearing in the breaker should also be checked at least two times per year. Check the bearing by: pushing the bail clamp back and removing the ice chute cover unscrewing the ice sweep unscrewing the breaker cover unscrewing the auger stud BREAKER COVER Page 14
CLEANING In some installations the water supply to the ice maker will be so concentrated with dissolved minerals, (such as calcium carbonate) that as ice is made, the evaporator and auger become coated with the minerals, requiring a more frequent cleaning than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can be inspected. Note: Water filters can filter out suspended solids, but not dissolved solids. "Soft" water may not be the complete answer. Check with a water treatment specialist regarding water treatment. DIVIDER, AUGER AND SLOTTED COLLAR ALLEN HEAD SCREWS Single System RL Switch off electrical power, and shut off the water supply. For more information on removal of these parts, see REMOVAL AND REPLACEMENT. 1. To remove the auger, remove front and top panel. If top panel cannot be removed, or if there is less than 6" clearance over the top of the machine, the gearmotor/evaporator may be slid out for service access. See Removal And Replacement. 2. Push bail clamp back and remove ice chute cover. 3. Unscrew and remove ice sweep. 4. Loosen band clamp under ice chute, and remove ice chute from evaporator. 5. Remove 4 allen head screws holding breaker to evaporator. 6. Pull up on breaker to remove auger. Allow the auger to dry, the stainless steel of the auger and evaporator must be clean and bright. Clean the auger and evaporator as required. DO NOT HONE THE EVAPORATOR. 7. Replace the water seal. 8. Reverse to reassemble. Page 15
Single System RL SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate. B. Check: The master switch, switch ON if off. C. Check the water level in the reservoir. The machine will not run if there is not enough water in the reservoir. Restore/adjust water level. STATUS: NOTHING OPERATES D. Check: The gear motor, if it will not run, the liquid line valve will not open. If no power to it: Check: The indicator lights on the circuit board, the bin empty light should be ON, the no water light should be OFF. 1. If the bin empty and no water lights are off, check the transformer. a. Transformer "load" side should have 12 to 15 volts. If not, check the "line" side. The line side should have between 208-230 volts. If the line side has the correct voltage and the load side does not, replace the transformer. 2. If the transformer is good, and the bin empty light is OFF, check the ice level sensors. a. Remove sensors by sliding them sideways out of the ice chute. Visually inspect them, clean if needed. b. Look through the ice chute "eye" hole for something blocking the ice chute. c. If the unit still does not run, replace the ice level sensors. d. If the bin empty light is still OFF, check the circuit board. SEE LAST PAGE FOR TESTER INFORMATION 3. If the transformer is fine, and the "no water" light is ON, check the water level sensor. a. Check the water level in the reservoir, restore if low. If the water level is ok: b. Remove the water level sensor from the reservoir and clean the tip if dirty. CAUTION: THE TIP IS MADE OF GLASS c. Replace the water level sensor. If the no water light is still on, check that the "water sen" plug is firmly plugged into the circuit board. d. If the no water light is still on, SEE LAST PAGE FOR TESTER INFORMATION e. If after the above, the machine still will not run, replace the water level sensor Page 16
STATUS: GEARMOTOR OPERATES, BUT NO ICE IS MADE A. Check the liquid line valve relay. Single System RL The relay is on the circuit board, if it does not supply power to the liquid line valve, the valve will not open. 1. Check for power at the valve coil, if none: a. Check for power at the liquid line valve relay at the circuit board. If there is power at the relay, but none at the liquid line valve coil, Check for an open wire between the relay and the valve. 2. Check the valve coil. If the coil is open, replace the liquid line valve. 3. Check the auger drive motor centrifugal switch. If, when the drive motor is running, contact 4 (black wire removed) has no power, and all of the above switches have been checked, replace the centrifugal switch, or the drive motor. 4. If the liquid line valve relay on the circuit board has power on the NO contact, but not on the COM contact, replace the circuit board. Page 17
Single System RL REMOVAL AND REPLACEMENT WATER RESERVOIR 1. Shut off the water supply to the ice maker. 2. Remove front panel and reservoir cover. 3. To remove float only, disconnect water inlet tube, push in the tab behind the reservoir and pull valve assembly out of the reservoir tank. 4. To remove reservoir, disconnect water inlet compression fitting at reservoir inlet. 5. Remove drain hose from reservoir. 6. Remove evaporator inlet hose from reservoir. 7. Remove mounting screws from reservoir bracket, and remove reservoir from ice maker. 8. Reverse to reassemble. BIN CONTROLS (Ice Level Sensors) 1. Disconnect electrical power. 2. Remove front panel. 3. Remove control box cover. 4. Locate ice chute, at the base of the chute, in front of and behind it are two plastic bin control mounts. 5. Slide each bin control to the left, and in the control box, disconnect the electrical leads connecting the bin control to the circuit board. 6. Reverse to reassemble, be certain that the bin controls are aligned so that the ice level sensors are visible (centered) through the holes in the cube chute. Internal Plunger SLIDE BIN CONTROLS IN AND OUT Float Valve Page 18
REMOVAL AND REPLACEMENT: Bearing And Breaker Note: Removal of the auger, water seal, evaporator and gearmotor must begin at the top of the assembly. To Remove the Breaker Bearing Assembly: Electrical Shock Hazard Electrical shock can cause personal injury. Disconnect electrical power before beginning. 1. Remove panels and disconnect electrical power. 2. Push back bail clamp, remove insulation retaining strap and insulation, remove ice chute cover. 3. Unscrew and remove ice sweep. 4. Loosen band clamp under ice chute, lift up and remove ice chute. 5. The breaker may be removed from the auger and evaporator without disturbing the auger. a. Unscrew breaker cover from breaker (left hand threads) b. Unscrew auger stud from top of auger. c. Unscrew 4 allen head cap screws holding breaker to evaporator.. Lift up, and remove breaker/bearing assembly from auger & evaporator. 6. Service the bearing. Check for rust, rough spots and damage. a. The bearing is pressed into the breaker, to remove the bearing and replace it an arbor press is needed. b. Replace lower seals before installing new bearing in breaker. Note: seals must be pressed in with a tool pushing against the outer edge only, they will not install by hand. Replace parts as required. Re-grease bearing with Scotsman part no. 19-0609-01 bearing grease. Replace top seal, and check the o-rings, replace if cut or torn. 7. Reverse to reassemble: specific tools and materials are required to install properly. a. Add food grade grease such as Scotsman part number 19-0569-01 to the seal area before installing on the auger. b. Check the seal to shaft areas for cuts, or rough spots: none are permitted. Step 5- a dstep 5-b Step 5-c and Step 6 ICE SWEEP Single System RL BEARING SEALS AUGER STUD SLOTTED COLLAR BREAKER COVER DIVIDER Page 19
Single System RL REMOVAL AND REPLACEMENT To Remove the Auger: Turn off the water to the machine, and unclip the evaporator drain hose, pull it down and drain the evaporator into the bin or a container. Electrical Shock Hazard Electrical shock can cause personal injury. Disconnect electrical power before beginning. 1. The top panel must be removed. 2. Remove ice chute cover. 3. Unscrew ice sweep. 4. Loosen band clamp and remove ice chute body. 5. The auger and breaker/bearing may now be removed as an assembly. a. Unscrew 4 allen head cap screws holding breaker to evaporator. b. Lift up on breaker and remove auger from evaporator. d. Lift up and remove breaker from evaporator. e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole. The size of that hole is 5/8"-18. Inspect the auger, the critical areas of the auger are: 1. The auger body. It should be clean and shining. Sometimes an auger will appear clean when wet, but after it is dry it will be seen to be stained. Scrub the auger with ice machine cleaner and hot water. Ice machine cleaner is an acid. Handle it with extreme care, keep out of the reach of children. 2. The water seal area. Because the auger has been removed, the water seal will have to be replaced. Remove the water seal top half from the auger, and inspect the auger for minerals clean as required. DIVIDER AND AUGER ASSEMBLY SLIDE HAMMER PULLER THREAD INTO THE AUGER HERE Note: If the auger is stuck, the breaker must be removed from the auger. The breaker may be removed from the auger and evaporator without disturbing the auger. a. Use spanner wrench and unscrew breaker cover from breaker (left hand threads) b. Unscrew auger stud from top of auger. c. Unscrew 4 allen head cap screws holding breaker to evaporator. Page 20
REMOVAL AND REPLACEMENT Moving Parts Hazard. Moving parts can cause personal injury. Disconnect electrical power before beginning. To Remove the Water Seal: (Assuming all steps to remove the auger have been performed.) 1. The gearmotor/evaporator assembly will have to be exposed. 2. Remove the 4 hex head cap screws holding the evaporator to the gearmotor assembly. Lift the evaporator up and off of the gearmotor. 3. Remove the snap ring or wire retainer from the grove under the water seal. 4. Pull or drive out the lower half of the water seal. Single System RL To Replace the Water Seal: 1. Lubricate the water seal with water, and push the water seal into the bottom of the evaporator slightly past the grove for the snap ring. 2. Replace the snap ring and pull the water seal down against it. 3. The part of the water seal that rotates with the auger must also be replaced. Remove the old part from the auger and clean the mounting area. 4. Place a small bead of food grade silastic sealant (such as 732 RTV or Scotsman part number 19-0529-01) on the area of the auger where the water seal is to be mounted. 5. Carefully push the water seal (rubber side against the auger shoulder and the silastic.) CAUTION Do not get any silastic onto the face of the seal. 6. Allow the auger and seal to air dry until the silastic is dry on the surface. 7. If the original water seal was leaking, it would be a good idea to inspect the interior of the gearmotor. WATER SEAL RETAINING RING PLACE FOOD GRADE SEALANT HERE Page 21
Single System RL REMOVAL AND REPLACEMENT: Evaporator To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) 1. Shut the hand valves in the liquid and suction lines to the evaporator being serviced; then discharge the refrigerant. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. CAUTION Heat sink the TXV body when unsweating or resweating the adjacent tubing. b) At the suction line at the joint about 3" from the evaporator. 3. Remove the evaporator. 4. Unsweat the drier from the liquid line. ICE SWEEP 5. After installing a new water seal in the new evaporator (see "To Replace the Water Seal") sweat in the new evaporator at the old connections. 6. Install an new drier in the liquid line. 7. Evacuate the system until dehydrated, then weigh in the nameplate charge. Check for leaks. BEARING 8. Install auger, breaker, breaker bearing assembly, and ice discharge chute in reverse order of disassembly. See "To Reassemble Evaporator and Auger" To Reassemble the Evaporator and Auger 1. After the gearmotor has been inspected, fasten the evaporator to the gear motor, torque the bolts to 110 inch pounds. 2. Lower the auger into the evaporator barrel, slightly turning it to match up with the drive end. Do Not Drop Into the Evaporator. 3. Complete the reassembly by reversing the disassembly for the breaker & thrust bearing assembly. AUGER EVAPORATOR DRIP PAN DIVIDER/BREAKER Page 22
REMOVAL AND REPLACEMENT: Gearmotor To Remove and Repair the Gearmotor Assembly: (Assuming that the procedures through removal of the water seal have been performed.) 1. Remove the electrical wires from the gear drive motor. 2. Unscrew the 4 cap screws holding the gearmotor to the gearmotor plate. 3. Remove the gearmotor from the ice maker. To Inspect the gearmotor. A) Remove the cap screws holding the gearmotor case halves together and pry the two cases apart. B) To lift off the cover, lift up until you can feel internal contact, then pull the cover towards the output gear end, and then lift the cover (with drive motor attached) up and away from the gear motor case. Note: The case cover output gear, bearings, and shaft are one pressed together assembly. Replace as a unit. C) Inspect the oil, gears, and bearings. If the oil GEARCASE level and condition is acceptable, quickly check the gears and bearings. They are likely to be fine if the oil is. If there is evidence of water in the oil (rusty bearings and gears; the oil having a creamy white appearance; oil level too high) carefully inspect the bearings and gears. If in doubt about the condition of a part, replace it. The oil quantity is 16 fluid ounces, do not overfill. Note: The gears and bearings are available only as pressed together sets. D) After replacing parts as required, (if any) reassemble the gearcase. The two smaller gears and the oil should be in the lower case, the output gear will be with the cover. As you lower the cover onto the lower case, cover will have to be moved closer to the second gear after the output gear has cleared the second gear top bearing. E) After the case is together, and the locating pins are secure in both ends, replace all cap screws. 4. Bench test the gearmotor, check for oil leaks, noise, and amp draw. SEAL MOTOR GASKET Single System RL BEARING Page 23
Single System RL CIRCUIT BOARD TESTING These procedures require the machine to be connected to the power supply. The voltages of the electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. Do not touch anything but the tester while the unit is being checked out. Make all connections to the circuit board with the ELECTRICAL POWER OFF. INSTRUCTIONS FOR USING TESTER, (Optional, order part no. A33942-001) (These instructions assume that the unit will not run, and prior investigation of electric power, controls, and mechanical parts indicates that the electronic circuit may be at fault.) Note: All testing is done with the electrical power on, the master switch on. 1. Unplug photo trans and LED connectors from the circuit board. 2. Plug photo trans and LED connectors from the tester into the circuit board. 3. Unplug "water sen" connector from the circuit board. 4. Plug "water sen" connector from Scotsman tester into the circuit board. Bin Control: a. Move the bin full switch on the tester to Full. The light on the tester should be ON. If the light on the tester is not on, the circuit board should be replaced. b. If the light on the tester IS on, move the bin full switch to Bin Empty. The light on the tester should go OFF, and the Bin Empty light on the circuit board should go ON. If the Bin Empty light is ON, wait 10-20 seconds for the machine to start, if the machine starts, replace the ice level sensors. If the Bin Empty light does not come ON, the circuit board should be replaced. Water Level a. Move water switch on tester to No Water position. The No Water light on the circuit board should go ON. If not, replace the circuit board. b. Move the water switch on the tester to the Water position. The No Water light on the board should go OFF. If not replace the circuit board. If the light does go off, replace the water level sensor. If the Bin Empty light is ON, wait 10-20 seconds for the machine to start. The machine should start. LIGHT GOES ON PHOTO TRANS WATER SENS LED LIGHT GOES ON SWITCH TO "NO WATER" SWITCH TO "FULL" Page 24